That's the right question for someone like me being absolutely in love with the North Frisian Islands of Germany...

Ok, here are my 2 cents:

a) That should be the god Fosite, considered by Jacob Grimm to be identical with Forseti, son of Baldur and also known as Firihsazi to the Anglo-Saxon. As to the Grimnir song of the Edda, Forseti dwells in Glitnir "setting all strife an end" will say he serves as judge. Fosite was particularly worshipped on the German island of Helgoland, called Fositesland in ancient times. Fosite had a shrine there, sacred cattle grazed there and there also was a sacred well. I found a reference to how the Law was given to the Frisians here.

b) This must have been the missionary Willibrord (aka Apostle of the Frisians). During a missionary trip to the Danes a storm brought him to Helgoland. He slaughtered the sacred cattle and baptized three Frisians with water of the sacred well. To the great astonishement of the Frisians, he did not die on the spot doing this. The Frisian king Radbod was furious, but did not manage to kill Willibrord, maybe due to the latter's connection with king Pippin. Sources: Edda, Grimnirsmól J. Grimm: Teutonic Mythology www.sungaya.de Eala Frya Fresenea!